Research On Trust Model Of P2P Network

P2P technology has developed rapidly in recent years, which has been used widely in the fields of network file Sharing services, distributed computing, cooperative system and electronic commerce and has become hotspot in field of computer network technology research. However, the security and stability of P2P network are facing serious challenges because of its anonymity, openness and autonomy. So building a effective P2P network trust mechanism and setting up a credible web interaction platform is very important to the further development of P2P technology.Trust model was the most important parts in trust mechanism. Through collecting, transferring and estimating the historical action information of the peer in the network, the model can normalize and restrict the action by the peer credit value, the reliability of the P2P system is ensured to a certain extent. The users are encouraged to act well in the network by the credit model and the network gets a good development.On the basis of analyzing the existing trust model, this paper put forward a trust model based on preference and feedback result. It learns from trust mechanism of the relationship between human societies, evaluate peer's trust via quantitative method. In the model, we simulate the characteristic of the trust's attenuation with time and integrated preference-weighted recommendation mechanism with feedback result as the compose method of peer's trustworthiness. Besides, considering the fact that peer's recommended trust is affected by many factors, we introduce normal probability density function to analyze the stability of the peer's trustworthiness.On the recommended information searching mechanism, we propose a Probability Searching Algorithm based on recommended peer's trustne-ss to convey request query information, which set the probability of conv-eying the request query information to some peer based on the peer's trustness. By introduce this Algorithm, We could decrease the burden of network quickly which is caused by sending request query messages.In the last, we compare our trust model with two classic trust model on the basis of simulation platform. Experiment results show that our model is sensitive to the peer's behavior and shows advantages on the ability of resisting malicious peers'attack. All those above prove that our model has good security and effectiveness.